CA2055466A1 - Method and apparatus for monitoring an ac transmission line - Google Patents

Method and apparatus for monitoring an ac transmission line

Info

Publication number
CA2055466A1
CA2055466A1 CA002055466A CA2055466A CA2055466A1 CA 2055466 A1 CA2055466 A1 CA 2055466A1 CA 002055466 A CA002055466 A CA 002055466A CA 2055466 A CA2055466 A CA 2055466A CA 2055466 A1 CA2055466 A1 CA 2055466A1
Authority
CA
Canada
Prior art keywords
signal parameter
location
transmission line
time
parameter value
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002055466A
Other languages
French (fr)
Other versions
CA2055466C (en
Inventor
Gary R. Hoffman
Walter L. Hinman
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
DOWTY RFL INDUSTRIES Inc
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of CA2055466A1 publication Critical patent/CA2055466A1/en
Application granted granted Critical
Publication of CA2055466C publication Critical patent/CA2055466C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
    • H02H7/263—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of measured values

Landscapes

  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

The invention is directed to an improved method and apparatus for monitoring the status of an AC electrical transmission line (101; 102, 103) connected betweeen first and second locations. In a disclosed embodiment of the method of the invention, first signal parameter values are generated, for the first location, by time integrating between zero-crossings of an AC signal parameter measured at the first location. Second signal parameter values are generated, for the second location, by time integrating between zero-crossings of the AC signal parameter measured at the second location. A stared first signal parameter value is read out, the read-out value being associated with a time that is a predetermined time prior to the time at which a second parameter value is received at the first location. An indication of the status of the transmission line is then produced as a function of the second signal parameter value received at the first location and the read-out first signal parameter value.
CA002055466A 1989-05-05 1990-05-04 Method and apparatus for monitoring an ac transmission line Expired - Lifetime CA2055466C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US07/349,330 US4939617A (en) 1989-05-05 1989-05-05 Method and apparatus for monitoring an AC transmission line
US349,330 1989-05-05
PCT/US1990/002550 WO1990013934A1 (en) 1989-05-05 1990-05-04 Method and apparatus for monitoring an ac transmission line

Publications (2)

Publication Number Publication Date
CA2055466A1 true CA2055466A1 (en) 1990-11-06
CA2055466C CA2055466C (en) 2001-04-03

Family

ID=23371922

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002055466A Expired - Lifetime CA2055466C (en) 1989-05-05 1990-05-04 Method and apparatus for monitoring an ac transmission line

Country Status (9)

Country Link
US (1) US4939617A (en)
EP (1) EP0478574A4 (en)
JP (1) JPH04506745A (en)
KR (2) KR920702055A (en)
AU (1) AU5663390A (en)
CA (1) CA2055466C (en)
IL (1) IL94284A (en)
MY (1) MY105724A (en)
WO (1) WO1990013934A1 (en)

Families Citing this family (15)

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DE69022555T2 (en) * 1989-04-06 1996-05-30 Fuji Electric Co Ltd DEVICE FOR DETECTING THE DISCONNECTION OF A DISTRIBUTED POWER SUPPLY SYSTEM.
US5150270A (en) * 1991-03-01 1992-09-22 Dowty Rfl Industries, Inc. Transformer circuit and method with saturation prevention
US5329414A (en) * 1992-03-06 1994-07-12 Rfl Electronics Inc. Protective relay interface
US6567256B1 (en) * 1993-08-06 2003-05-20 Schweitzer Engineering Labs, Inc. Dual protective relay for power systems
US6081768A (en) * 1996-05-13 2000-06-27 Abb Power T&D Company Inc. Digital peak detector
US5671112A (en) * 1996-05-13 1997-09-23 Abb Power T&D Company, Inc. Digital integrator V/Hz relay for generator and transformer over-excitation protection
US5805395A (en) * 1996-12-13 1998-09-08 Abb Power T&D Company Inc. Half-cycle summation V/Hz relay for generator and transformer over-excitation protection
RU2202114C2 (en) * 1997-12-05 2003-04-10 Эйбиби Пауэ Ти Энд Ди Компани Инк. Method and system for detecting current and/or voltage unbalance in multiphase power supply
DE19959793B4 (en) 1999-12-07 2007-03-08 Siemens Ag Differential protection method
DE19959776B4 (en) * 1999-12-07 2008-12-11 Siemens Ag Differential protection method
JP4669627B2 (en) * 2001-04-26 2011-04-13 株式会社イシダ Combination weighing device and combination weighing packaging system
US6737837B1 (en) * 2002-11-25 2004-05-18 Abb Ab Device and a method for control of power flow in a transmission line
KR100762356B1 (en) * 2007-04-13 2007-10-04 주식회사하우엔지니어링건축사사무소 Breaker with address setting function and power control method using same
US9166876B2 (en) 2013-04-25 2015-10-20 Powercomm Solutions, Llc Power communications monitor for power line carrier and audio tone communication systems
CN113224839A (en) * 2021-04-25 2021-08-06 深圳市芯中芯科技有限公司 Power monitoring method and monitoring equipment

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Publication number Priority date Publication date Assignee Title
US2144493A (en) * 1936-11-13 1939-01-17 Westinghouse Electric & Mfg Co Pilot protective system
US2376752A (en) * 1940-07-19 1945-05-22 Westinghouse Electric & Mfg Co Pilot relaying system
US2641634A (en) * 1950-06-29 1953-06-09 Donald J Marihart Phase comparison electronic relay protective system
DE1102890B (en) * 1960-02-03 1961-03-23 Siemens Ag Protection device for high voltage lines
JPS5128813B1 (en) * 1968-02-02 1976-08-21
US3983455A (en) * 1975-01-15 1976-09-28 Westinghouse Electric Corporation Direct transfer-trip relaying system
US4020396A (en) * 1975-02-07 1977-04-26 Westinghouse Electric Corporation Time division multiplex system for a segregated phase comparison relay system
US4056838A (en) * 1976-09-20 1977-11-01 Westinghouse Electric Corporation In-band signal-to-noise ratio monitor for an FSK relaying system
SE408983B (en) * 1977-11-11 1979-07-16 Asea Ab DIFFERENTIAL PROTECTION
US4180841A (en) * 1977-11-21 1979-12-25 Westinghouse Electric Corp. Ground fault circuit interrupter with grounded neutral protection
US4275429A (en) * 1979-10-12 1981-06-23 Westinghouse Electric Corp. Protective relay apparatus
JPS56136121A (en) * 1980-03-25 1981-10-24 Mitsubishi Electric Corp Multiterminal protecting relay
US4295175A (en) * 1980-04-21 1981-10-13 General Electric Company Pilot wire relay protection system for electrical distribution networks
JPS5875419A (en) * 1981-10-29 1983-05-07 株式会社東芝 sampling time synchronizer
US4408246A (en) * 1982-01-13 1983-10-04 Westinghouse Electric Corp. Protective relay apparatus
JPS596715A (en) * 1982-07-01 1984-01-13 三菱電機株式会社 Differential protection relay device
US4464697A (en) * 1982-07-13 1984-08-07 Westinghouse Electric Corp. Protective relay system
US4513340A (en) * 1982-12-13 1985-04-23 The Montana Power Company Power transmission line protective apparatus
US4538196A (en) * 1983-04-22 1985-08-27 Westinghouse Electric Corp. Protective relay apparatus and method for providing single-pole tripping
JPS6025336A (en) * 1983-07-21 1985-02-08 Hitachi Ltd Carrier relay system
JPS6039310A (en) * 1983-08-12 1985-03-01 株式会社東芝 Sampling synchronizing method
US4538195A (en) * 1984-02-22 1985-08-27 Westinghouse Electric Corp. Three terminal current differential protective relay
JPS60180421A (en) * 1984-02-27 1985-09-14 三菱電機株式会社 Differential protection relay device
US4672501A (en) * 1984-06-29 1987-06-09 General Electric Company Circuit breaker and protective relay unit
US4598331A (en) * 1984-07-30 1986-07-01 Technology Research Corporation Ground fault current interrupter circuit with open neutral and ground lead protection
US4631625A (en) * 1984-09-27 1986-12-23 Siemens Energy & Automation, Inc. Microprocessor controlled circuit breaker trip unit
FR2572597B1 (en) * 1984-10-30 1986-12-26 Telemecanique Electrique SECURITY DEVICE FOR DIFFERENTIAL PROTECTION APPARATUS
US4675774A (en) * 1985-12-13 1987-06-23 Westinghouse Electric Corp. Direct transfer trip apparatus for use with an active pilot wire communications channel
US4675775A (en) * 1985-12-13 1987-06-23 Westinghouse Electric Corp. Active pilot wire apparatus for electromechanical current differential relays
US4725914A (en) * 1986-12-16 1988-02-16 Westinghouse Electric Corp. Protective relay system for performing selective-pole trip determination

Also Published As

Publication number Publication date
KR920702055A (en) 1992-08-12
AU5663390A (en) 1990-11-29
IL94284A0 (en) 1991-03-10
IL94284A (en) 1994-04-12
JPH04506745A (en) 1992-11-19
EP0478574A1 (en) 1992-04-08
US4939617A (en) 1990-07-03
EP0478574A4 (en) 1992-10-21
KR930010683B1 (en) 1993-11-05
WO1990013934A1 (en) 1990-11-15
CA2055466C (en) 2001-04-03
MY105724A (en) 1994-11-30

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed
MKEC Expiry (correction)

Effective date: 20121202